What Causes Pubic Area Inflammation And Pain With Discharge?

Hi.im girl of 20 yrs old.i have noticed inflammation and pain in my pubic area since past 3days..i noticed it first when i reached home after travelling for long..there was pain in that area & i was not able to walk or touch over there..i thought it was due to friction.i applied vasaline.then when i saw it in the 3rd day it was horrible to see..it ws more inflammed with yellowish discharge..im really scared about it..please help me out..